#!/usr/bin/env python3
import argparse
import logging
import os
import subprocess
import sys
import time

LOCAL_GIT_CACHE_DIR = "/srv/zulip.git"
os.environ["PYTHONUNBUFFERED"] = "y"

sys.path.append(os.path.join(os.path.dirname(__file__), "..", ".."))
from scripts.lib.zulip_tools import (
    DEPLOYMENTS_DIR,
    assert_running_as_root,
    get_config,
    get_config_file,
    get_deploy_options,
    get_deployment_lock,
    make_deploy_path,
    overwrite_symlink,
    release_deployment_lock,
    su_to_zulip,
)

config_file = get_config_file()
deploy_options = get_deploy_options(config_file)
upstream_url = "https://github.com/zulip/zulip.git"
remote_url = get_config(config_file, "deployment", "git_repo_url", upstream_url)

assert_running_as_root(strip_lib_from_paths=True)

# make sure we have appropriate file permissions
os.umask(0o22)

logging.Formatter.converter = time.gmtime
logging.basicConfig(format="%(asctime)s upgrade-zulip-from-git: %(message)s", level=logging.INFO)

parser = argparse.ArgumentParser()
parser.add_argument("refname", help="Git reference, e.g. a branch, tag, or commit ID.")
parser.add_argument(
    "--remote-url", help="Override the Git remote URL configured in /etc/zulip/zulip.conf."
)
args = parser.parse_args()

refname = args.refname
# Command line remote URL will be given preference above the one
# in /etc/zulip/zulip.conf.
if args.remote_url:
    remote_url = args.remote_url

os.makedirs(DEPLOYMENTS_DIR, exist_ok=True)
os.makedirs("/home/zulip/logs", exist_ok=True)

error_rerun_script = f"{DEPLOYMENTS_DIR}/current/scripts/upgrade-zulip-from-git {refname}"
get_deployment_lock(error_rerun_script)

try:
    deploy_path = make_deploy_path()

    # Populate LOCAL_GIT_CACHE_DIR with both the requested remote and zulip/zulip.
    if not os.path.exists(LOCAL_GIT_CACHE_DIR):
        logging.info("Cloning the repository")
        subprocess.check_call(
            ["git", "clone", "-q", remote_url, "--mirror", LOCAL_GIT_CACHE_DIR],
            stdout=subprocess.DEVNULL,
        )
    if os.stat(LOCAL_GIT_CACHE_DIR).st_uid == 0:
        subprocess.check_call(["chown", "-R", "zulip:zulip", LOCAL_GIT_CACHE_DIR])

    os.chdir(LOCAL_GIT_CACHE_DIR)
    subprocess.check_call(
        ["git", "remote", "set-url", "origin", remote_url], preexec_fn=su_to_zulip
    )

    # Ensure upstream remote is configured; we need this to make `git describe` accurate.
    remotes = subprocess.check_output(["git", "remote"], preexec_fn=su_to_zulip).split(b"\n")
    if b"upstream" not in remotes:
        subprocess.check_call(
            ["git", "remote", "add", "upstream", remote_url], preexec_fn=su_to_zulip
        )

    logging.info("Fetching the latest commits")
    subprocess.check_call(
        ["git", "fetch", "--prune", "--quiet", "--tags", "--all"], preexec_fn=su_to_zulip
    )

    # Generate the deployment directory via git worktree from our local repository.
    subprocess.check_call(
        ["git", "worktree", "add", "--detach", deploy_path, refname],
        stdout=subprocess.DEVNULL,
        preexec_fn=su_to_zulip,
    )
    os.chdir(deploy_path)
    subprocess.check_call(
        ["git", "checkout", "-qtb", "deployment-" + os.path.basename(deploy_path), refname],
        preexec_fn=su_to_zulip,
    )

    overwrite_symlink("/etc/zulip/settings.py", "zproject/prod_settings.py")

    overwrite_symlink(deploy_path, os.path.join(DEPLOYMENTS_DIR, "next"))

    try:
        subprocess.check_call(
            [
                os.path.join(deploy_path, "scripts", "lib", "upgrade-zulip-stage-2"),
                deploy_path,
                "--from-git",
                *deploy_options,
            ]
        )
    except subprocess.CalledProcessError:
        # There's no use in showing a stacktrace here; it just hides
        # the error from stage 2.
        sys.exit(1)
finally:
    release_deployment_lock()
